Arb worked with the world's greatest rock producers.
Bob Rock (Metallica, Bon Jovi), Bruce Fairburn (AC/DC),
Tom Allom (Judas Priest), Tom Werman (Ted Nugent, Mötley Crüe)
and many more. As a co producer he is responsible for numerous
krokus records. Besides that he produced, alias Rob Weiss,
the legendary „Metal Marathon“ rock compilations.